SMC Networks SMC8013WG - Manual (Page 30)

Command SNIFF: "sniff [u|d|u+d] x [0|1]"
Description: Sniff the upstream/downstream/upstream & downstream for x seconds and
display them by original sniffing format (for 0) or Comcast’s format (for 1).
Command NATSHOW: "natShow"
Description: Display the existing NAT session log in the CM.